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Clean metallurgical method for low-temperature molten salt of lead

A low-temperature molten salt, clean technology, applied in the field of non-ferrous metal metallurgy, can solve the problems of air, land and water pollution, difficult to deal with, flue gas pollution, etc., to promote technological progress, improve vertical yield, and promote energy saving and reduction. row effect

Inactive Publication Date: 2012-07-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The traditional lead smelting process is mainly sintering machine sintering-blast furnace reduction smelting or bottom blowing furnace smelting process, both of which are carried out at a high temperature of 1250-1350 °C, which not only consumes high energy, but also has the following environmental problems that are difficult to solve: (1) The lead smelting process produces a large amount of lead vapor and dispersed lead mist, causing serious pollution of air, land and water sources in the surrounding area of ​​the factory; low concentration of SO 2 Flue gas pollution, lead matte treatment and copper recovery are currently unresolved problems; (3) Traditional lead smelting processes cannot or are difficult to deal with complex lead ore, recycled lead raw materials and secondary lead materials

Method used

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  • Clean metallurgical method for low-temperature molten salt of lead

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The chemical composition of lead sulfide concentrate is (%): Pb70.12, Fe6.08, S15.04, Zn2.84, Cu0.40, SiO 2 0.79. , the chemical composition of pulverized coal is (%): C 82.33, S 3.01, SiO 2 6.66, CaO 0.83, Al 2 o 3 4.81. Weigh 100g of lead sulfide concentrate, 10.0g of pulverized coal, 200g of industrial grade sodium carbonate and 35.07g of sub-zinc oxide containing Zn78.33% and mix them evenly, put them into a graphite crucible, and then melt in a resistance furnace at 900°C for 2h. 67.34g of crude lead containing Pb 98.40% was produced, and the direct recovery rate of lead reached 94.5%; hot state molten salt clarified and separated the solid to obtain 162.5g of molten sodium carbonate and 111.7g of solid slag of a small part of sodium carbonate bonded, Leach with 300mL tap water at room temperature for 3h to obtain dry leaching residue 71.3%, containing Zn 42.51%, S21.01%, sulfur fixation rate 99.61%; filtrate volume is 340mL, containing Na 2 CO 3 180g / L, a...

Embodiment 2

[0039] Using waste storage battery cement as raw material, the composition is: Pb74.15%, S7.85%, coke powder as reducing agent, containing C82%, ash10%. Weigh 100g of cement, 15g of coke powder and 31.79g of copper oxide soot containing Cu49.03% respectively, add 162.5g of molten sodium carbonate returned in Example 1, mix evenly, put into a graphite crucible, and cover the NaHCO returned in Example 1 3 65g. Melting 1.5h at 870 DEG C in the electric resistance furnace then, the crude lead 72.13g that output contains Pb 97.66%, the direct recovery rate of lead reaches 95.00%; Obtain molten sodium carbonate 146g and molten sodium carbonate after clarification and separation of solid matter in hot state molten salt 71.2 g of solid slag bonded with a small portion of sodium carbonate was leached with 300 mL of tap water at room temperature for 2 hours to obtain 54.2 g of dry leached residue, containing 28.76% Cu, 14.48% S, and a sulfur fixation rate of 99.99%; Filtrate volume is...

Embodiment 3

[0041] Using lead-copper concentrate as raw material, its composition (%) is: Pb40.85, Cu18.17, Zn8.87, S20.16%, SiO 2 3.27, Fe5.66, the pulverized coal of Example 1 is used as reducing agent, and the copper oxide soot of Example 2 is used as sulfur-fixing agent. Weigh 500g of lead-copper concentrate, 40g of pulverized coal, and 127.76g of copper oxide soot containing Cu49.03%, add 852g of sodium carbonate, mix evenly, put them into a graphite crucible, and then cover with NaHCO 3 325g. Melting 1.0h at 860 DEG C in the electric resistance furnace then, the crude lead 194.96g that output contains Pb 98.06%, the direct recovery rate of lead reaches 93.60%; 591.56g of solid slag bonded with a small portion of sodium carbonate was leached with 1500mL of tap water at room temperature for 2.5h, and washed with water to obtain 284.5g of dry leached slag, containing Cu53.95%, Zn15.59%, S34.80 %, the sulfur fixation rate is 98.12%; the filtrate volume is 1760mL, containing Na 2 CO ...

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Abstract

The invention discloses a clean metallurgical method for low-temperature molten salt of lead. Lead sulfide concentrate, secondary lead raw material or secondary material of lead is smelted in low-temperature inertial molten salt and rough lead is refined in one step; and a metal oxide is used as a sulfur fixing agent, wherein the smelted product comprises liquid metal lead and solid sulfur-fixingmetal sulfide and the solid sulfur-fixing metal sulfide and solid unreacted material are together called solid matter; the majority of the inertial molten salt is separated from the solid matter to return the smelting process in hot state; a small part of the inertial molten salt adhered by the solid matter is processed by a wet method for recycling; the solid matter after the molten salt is removed by soaking is subjected to ore dressing to recover associated metal and the sulfur-fixing metal sulfide; the sulfide is baked for desulfurization; the smoke is used for making acid; and the oxide is calcined and returned to the smelting process and used as the sulfur fixing agent. The method greatly reduces the metallurgical temperature of the lead, produces the rough lead in one step, realizes the recovery of the sulfur and the utilization of the sulfide energy source, has simple flow and low cost, greatly improves the yield of the vertical force and completely eliminates the lead steam produced during the metallurgical process and the pollution caused by the SO2 smoke to the environment.

Description

technical field [0001] The invention relates to a low-temperature molten salt clean metallurgy method for lead, which belongs to the field of nonferrous metal metallurgy. Background technique [0002] The traditional lead smelting process is mainly sintering machine sintering-blast furnace reduction smelting or bottom blowing furnace smelting process, both of which are carried out at a high temperature of 1250-1350 °C, which not only consumes high energy, but also has the following environmental problems that are difficult to solve: (1) The lead smelting process produces a large amount of lead vapor and dispersed lead mist, which causes serious pollution of air, land and water sources in the surrounding area of ​​the factory; low concentration SO 2 Smoke pollution, lead matte treatment and copper recovery are unresolved problems; (3) Traditional lead smelting process cannot or is difficult to deal with complex lead ore, secondary lead raw materials and secondary lead materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B13/00
Inventor 唐谟堂唐朝波陈永明杨建广杨声海何静王一霖
Owner CENT SOUTH UNIV
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